Port restoreCache to new service

src/internal/config.ts

@@ -6,6 +6,7 @@ export function getRuntimeToken(): string {
   return token
 }
 
+// TODO: Use the feature flag to determine the cache service version
 export function getCacheServiceVersion(): string {
   return process.env['ACTIONS_CACHE_SERVICE_VERSION'] || 'v1'
 }